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<p>To investigate the failure mechanisms of air-backed reinforced concrete (RC) slabs under repeated underwater explosions, a combined experimental and numerical study was conducted. Three RC slabs were subjected to two sequential explosions: the first with 2.4&#xa0;g of TNT and the second with 1.6&#xa0;g of TNT, resulting in six blast tests. The Arbitrary-Lagrangian-Eulerian algorithm was used to create multi-media coupling models of the RC slabs exposed to underwater explosions. Both experimental and numerical investigations were performed to examine the acceleration response, damage evolution, and shock wave propagation. The validity of the numerical method was confirmed by comparing the numerical results with experimental data. Using the validated model, the study further explored the effects of single detonation and two detonations with varying explosion sequences on the cumulative damage and dynamic response of the RC slabs while maintaining a constant total explosive mass. For total explosive masses of 4.0&#xa0;g and 6.0&#xa0;g of TNT, a single explosion produced the most pronounced dynamic response, resulting in the largest damage. For a total of 10&#xa0;g of TNT, repeated underwater explosions, where the first detonation was larger and the second smaller, resulted in the most pronounced cumulative damage and dynamic response.</p>

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Dynamic Response and Cumulative Damage of Air-Backed RC Slabs Against Repeated Underwater Explosions

  • 期刊论文

  • 发表日期：

    2026年6月22日

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  • Guangdong Yang,
  • Rui Guo,
  • Shengyong Ding,
  • Tao Zhou,
  • Xianze Cui,
  • Bin Tian,
  • Yong Fan

摘要

To investigate the failure mechanisms of air-backed reinforced concrete (RC) slabs under repeated underwater explosions, a combined experimental and numerical study was conducted. Three RC slabs were subjected to two sequential explosions: the first with 2.4 g of TNT and the second with 1.6 g of TNT, resulting in six blast tests. The Arbitrary-Lagrangian-Eulerian algorithm was used to create multi-media coupling models of the RC slabs exposed to underwater explosions. Both experimental and numerical investigations were performed to examine the acceleration response, damage evolution, and shock wave propagation. The validity of the numerical method was confirmed by comparing the numerical results with experimental data. Using the validated model, the study further explored the effects of single detonation and two detonations with varying explosion sequences on the cumulative damage and dynamic response of the RC slabs while maintaining a constant total explosive mass. For total explosive masses of 4.0 g and 6.0 g of TNT, a single explosion produced the most pronounced dynamic response, resulting in the largest damage. For a total of 10 g of TNT, repeated underwater explosions, where the first detonation was larger and the second smaller, resulted in the most pronounced cumulative damage and dynamic response.